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Washington, D.C., police say they arrested a New Jersey man with hundreds of homemade explosives and a manifesto containing "significant animosity" toward Catholics, Jews, the U.S. Supreme Court and Immigration and Customs Enforcement outside a cathedral hours before it was supposed to host an annual event that some justices were expected to attend.

A Metropolitan Police Department officer found Louis D. Geri, 41, camped out in a green tent in front of the Cathedral of St. Matthew the Apostle in Washington, D.C. around 5 a.m. on Sunday.

Police were securing the area ahead of the event, called Red Mass, and they asked Geri to move his tent, according to an affidavit.

"You might want to stay back and call the federales," G

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